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Original article

Can improving prism fusion range with training also improve stereo-acuity?

Authors:

Melanie Watson ,

Academic Unit of Ophthalmology and Orthoptics, University of Sheffield, Sheffield
About Melanie
BMedSci
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Helen Davis,

Academic Unit of Ophthalmology and Orthoptics, University of Sheffield, Sheffield
About Helen
DBO(T)
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David Buckley

Academic Unit of Ophthalmology and Orthoptics, University of Sheffield, Sheffield
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PhD
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Abstract

Aim: We tested whether prism fusion range (PFR) could be improved by training and whether any improvement in PFR also led to improvement in stereo-acuity.

Methods: The PFR and stereo-acuity thresholds of 15 participants with normal or corrected-to-normal vision were tested intially then at 1 week and 5 weeks. Eight of the participants, the experimental group, were instructed in training their base-in and base-out near prism fusion at home for 10 minutes twice each day for 1 week. Seven participants, the control group, were simply tested on three occasions without training.

Results: For the experimental group after 1 week both near and distant PFR had significantly improved, by over 10 compared with the control group. Stereo-acuity had improved significantly but modestly by about 3 sec arc. However, 4 weeks later, during which no further training occurred, both PFR and stereo-acuity were no longer significantly different between the groups.

Conclusions: Although in visually normal participants training of near PFR can lead to improvement in near and distant PFR and stereo-acuity, in the longer term no differences were found between the trained group and a control group who were untrained. These results emphasise the importance of including for comparison a non-treatment group in such studies.

 
DOI: http://doi.org/10.22599/bioj.54
How to Cite: Watson, M., Davis, H. & Buckley, D., (2012). Can improving prism fusion range with training also improve stereo-acuity? . British and Irish Orthoptic Journal . 9 , pp . 44–48 . DOI: http://doi.org/10.22599/bioj.54
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Published on 01 Aug 2012.
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